I downloaded the new 14w30b, but when I created a new world, the ground was strobing and the water was white. It then crashed.

Here is the crash report:

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 7/23/14 10:23 PM
Description: Tesselating block model

java.lang.IndexOutOfBoundsException: Index: 1, Size: 0
	at java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at csu.b(SourceFile:88)
	at chc.a(SourceFile:156)
	at cjs.a(SourceFile:254)
	at cjs.b(SourceFile:105)
	at cjs.a(SourceFile:45)
	at cjs.a(SourceFile:35)
	at cjq.a(SourceFile:62)
	at cmt.b(SourceFile:156)
	at cmm.a(SourceFile:71)
	at cmm.run(SourceFile:31)
	at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at csu.b(SourceFile:88)
	at chc.a(SourceFile:156)
	at cjs.a(SourceFile:254)
	at cjs.b(SourceFile:105)

-- Block model being tesselated --
Details:
	Block: minecraft:gravel
	Block location: World: (196,48,324), Chunk: (at 4,3,4 in 12,20; contains blocks 192,0,320 to 207,255,335), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Using AO: false
Stacktrace:
	at cjs.a(SourceFile:45)
	at cjs.a(SourceFile:35)

-- Block being tesselated --
Details:
	Block type: ID #13 (tile.gravel // avl)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (196,48,324), Chunk: (at 4,3,4 in 12,20; contains blocks 192,0,320 to 207,255,335), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
	at cjq.a(SourceFile:62)
	at cmt.b(SourceFile:156)
	at cmm.a(SourceFile:71)
	at cmm.run(SourceFile:31)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 14w30b
	Operating System: Windows Vista (x86) version 6.0
	Java Version: 1.7.0_55, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 143003176 bytes (136 MB) / 400134144 bytes (381 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	IntCache: cache: 0, tcache: 52, allocated: 13, tallocated: 95

i got it to work.
when i first loaded to world, my texture pack from 1.7 was on. it started to strobe. so i turned it off. it probably was still using 1.7 default texture when i turned mine off. after i crashed I re-downloaded the snapshot. when i opened the same world, it was on the default texture pack and it wasn't strobing.